random number generation invgaussian and score weights fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@866 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
lognormal2: score weights fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@867 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
lognormal2: score weights fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@868 edb9625f-4e0d-4859-8d74-9fd3b1da38cb